talia rothstein is one of the coordinators of divest harvard. she's been participating in a blockade of mass hall. she's a sophomore at harvard college. and naomi oreskes is history of science professor and affiliated professor of earth and planetary sciences at harvard university. her 2004 essay, "the scientific consensus on climate change," was widely cited, including by al gore in an inconvenient truth, and led to congressional -- and she is co-author with eric conway of, "the collapse of western civilization: a view from the future" and "merchants of doubt: how a handful of scientists obscured the truth on issues from tobacco smoke to global warming." thank you for coming off-campus, talia to engage in this interview. tell us what is happening on campus right now. >> thank you for having me. this morning we expanded our blockade. we have been holding down a blockade of massachusetts hall which is the main administrative building since under evening. this morning, students and alumni located university hall starting at 6:00 a.m. and holding i